研究目的
To evaluate setup errors of the optical surface scanner Catalyst HD (C-RAD AB) in different anatomic regions for patient positioning in radiation therapy.
研究成果
The optical surface scanner Catalyst HD is a reliable and feasible patient positioning system without any additional radiation exposure. From the head to the thoracic and abdominal region, a decrease in accuracy was observed within a comparable range for Catalyst and laser-assisted positioning.
研究不足
The study's limitations include the decrease in accuracy of the Catalyst system from the head to the thoracic and abdominal regions, and the exclusion of the vertical direction of the abdominal region from the general concordance of the two methods.
1：Experimental Design and Method Selection:
The study was designed as a prospective observational study to evaluate the setup errors of the Catalyst HD optical surface scanner compared to conventional laser-based positioning and CBCT as the gold standard.
2：Sample Selection and Data Sources:
A total of 1902 treatment sessions in 110 patients were evaluated between October 2016 and June
3：List of Experimental Equipment and Materials:
20 The Catalyst HD optical surface scanner from C-RAD AB, room laser, skin marks, and CBCT (X-ray volume imaging by Elekta AB) were used.
4：Experimental Procedures and Operational Workflow:
Patients were initially aligned using CBCT, followed by positioning via room laser and skin marks, and then a Catalyst surface scan was performed. Deviations from the Catalyst system and laser positioning were compared to CBCT corrections.
5：Data Analysis Methods:
Two one-sided t tests for equivalence were used for statistical analysis to compare the deviations of the Catalyst system and laser positioning to CBCT.
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